my dell laptop was working fine, until one day my sound wouldnt work and neither would my mic. i went to the control pannel, and it says there were no audio devices installed. now, i didnt disconnect my mic nor my volume, and i really want it back. do i have to install a audio device thingy, do i have to go and get it fixed or is there something on my laptop itself that can get it working again. THANK YOU!!!!!!!!!!!!!